Table. Baseline Characteristics of Participants in the Subcohort by Body Mass Index (BMI) Category.
| Variablea | BMI categories, mean (SD) | All (N = 628) | ||||
|---|---|---|---|---|---|---|
| <20 (n = 76) | 20-<22.5 (n = 163) | 22.5-<25.0 (n = 181) | 25.0-<27.5 (n = 114) | ≥27.5 (n = 94) | ||
| Age, y | 50.7 (11.1) | 51.8 (10.8) | 53.7 (11.1) | 51.0 (9.2) | 51.1 (9.8) | 52.2 (10.5) |
| Female, No. (%) | 46 (60.5) | 97 (59.5) | 111 (61.3) | 65 (57.0) | 66 (70.2) | 385 (61.3) |
| Socioeconomic and lifestyle factors, No. (%) | ||||||
| Urban region | 28 (36.8) | 69 (42.3) | 98 (54.1) | 67 (58.8) | 61 (64.9) | 323 (51.4) |
| ≥9 y of Education | 15 (19.7) | 32 (19.6) | 50 (27.6) | 28 (24.6) | 22 (23.4) | 147 (23.4) |
| Household income ≥$5261/yb | 15 (19.7) | 27 (16.6) | 23 (12.7) | 27 (23.7) | 24 (25.5) | 116 (18.5) |
| Ever regular smoking, No. (%) | ||||||
| Male | 22 (73.3) | 51 (79.7) | 35 (50.7) | 29 (60.4) | 20 (62.5) | 157 (64.6) |
| Female | 3 (6.5) | 2 (2.1) | 2 (1.8) | 1 (1.5) | 5 (7.6) | 13 (3.4) |
| Weekly drinking, No. (%)c | ||||||
| Male | 11 (36.7) | 25 (39.1) | 18 (26.1) | 17 (35.4) | 13 (40.6) | 84 (34.6) |
| Female | 0 | 0 | 2 (1.8) | 2 (3.1) | 4 (6.1) | 8 (2.1) |
| Total physical activity, metabolic equivalent of task h/d | 21.7 (16.2) | 21.1 (15.0) | 20.1 (13.6) | 17.9 (14.2) | 18.8 (13.4) | 20.2 (14.4) |
| Blood pressure and anthropometry | ||||||
| Systolic blood pressure, mm Hg | 120.2 (18.2) | 126.7 (22.8) | 129.2 (18.8) | 136.5 (22.0) | 135.2 (23.7) | 131.3 (21.9) |
| Random plasma glucose, mmol/L | 5.8 (2.5) | 5.5 (1.3) | 6.0 (2.8) | 6.1 (2.8) | 5.9 (2.6) | 6.0 (2.4) |
| BMI | 18.8 (0.9) | 21.3 (0.8) | 23.6 (0.7) | 25.9 (0.7) | 28.6 (2.1) | 23.9 (3.6) |
| Circumference, cm | ||||||
| Waist | 67.7 (5.0) | 73.3 (4.9) | 79.1 (6.1) | 85.8 (5.2) | 91.0 (8.3) | 80.2 (10.5) |
| Hip | 83.0 (3.8) | 86.7 (4.4) | 89.8 (4.1) | 93.8 (4.8) | 96.3 (6.1) | 90.9 (7.3) |
| Waist-to-hip ratio | 0.82 (0.05) | 0.85 (0.06) | 0.88 (0.06) | 0.91 (0.06) | 0.91 (0.07) | 0.88 (0.07) |
| Prior disease history, No. (%) | ||||||
| Coronary heart disease | 1 (1.3) | 2 (1.2) | 11 (6.1) | 7 (6.1) | 6 (6.4) | 27 (4.3) |
| Stroke or transient ischemic attack | 1 (1.3) | 2 (1.2) | 4 (2.2) | 2 (1.8) | 7 (7.4) | 16 (2.5) |
| Hypertension | 2 (2.6) | 9 (5.5) | 13 (7.2) | 19 (16.7) | 23 (24.5) | 66 (10.5) |
| Diabetes | 1 (1.3) | 2 (1.2) | 6 (3.3) | 5 (4.4) | 7 (7.4) | 21 (3.3) |
| Family history | ||||||
| Diabetes | 4 (5.3) | 6 (3.7) | 8 (4.4) | 11 (9.6) | 4 (4.3) | 33 (5.3) |
| Cancer | 10 (13.2) | 26 (16.0) | 23 (12.7) | 20 (17.5) | 17 (18.1) | 96 (15.3) |
Abbreviation: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared).
a
All means by BMI categories are adjusted for age, sex, and region, except for age (which was only adjusted for sex and region). The numbers, percentages, and SDs are unadjusted values.
b
This is 35 000 or more Chinese yuan (renminbi) per year.
c
The numbers of male participants by BMI categories (<20, 20-<22.5, 22.5-<25, 25-<27.5, and ≥27.5) were 30, 64, 69, 48, and 32, respectively; numbers of female participants by BMI categories were 46, 97, 111, 65, and 66, respectively.